Package androidx.constraintlayout.core.widgets

Class Placeholder

java.lang.Object

androidx.constraintlayout.core.widgets.ConstraintWidget

androidx.constraintlayout.core.widgets.HelperWidget

androidx.constraintlayout.core.widgets.VirtualLayout

androidx.constraintlayout.core.widgets.Placeholder

All Implemented Interfaces:

Helper

public class Placeholder
extends VirtualLayout

Simple VirtualLayout that center the first referenced widget onto itself.

Nested Class Summary

Nested classes/interfaces inherited from class androidx.constraintlayout.core.widgets.ConstraintWidget

ConstraintWidget.DimensionBehaviour

Field Summary

Fields inherited from class androidx.constraintlayout.core.widgets.VirtualLayout

mMeasure

Fields inherited from class androidx.constraintlayout.core.widgets.HelperWidget

mWidgets, mWidgetsCount

Fields inherited from class androidx.constraintlayout.core.widgets.ConstraintWidget

ANCHOR_BASELINE, ANCHOR_BOTTOM, ANCHOR_LEFT, ANCHOR_RIGHT, ANCHOR_TOP, BOTH, CHAIN_PACKED, CHAIN_SPREAD, CHAIN_SPREAD_INSIDE, DEFAULT_BIAS, DIRECT, frame, GONE, HORIZONTAL, horizontalChainRun, horizontalGroup, INVISIBLE, isTerminalWidget, mAnchors, MATCH_CONSTRAINT_PERCENT, MATCH_CONSTRAINT_RATIO, MATCH_CONSTRAINT_RATIO_RESOLVED, MATCH_CONSTRAINT_SPREAD, MATCH_CONSTRAINT_WRAP, mBaseline, mBottom, mCenter, mDimensionRatio, mDimensionRatioSide, measured, mHorizontalResolution, mHorizontalRun, mIsHeightWrapContent, mIsWidthWrapContent, mLeft, mListAnchors, mListDimensionBehaviors, mListNextMatchConstraintsWidget, mMatchConstraintDefaultHeight, mMatchConstraintDefaultWidth, mMatchConstraintMaxHeight, mMatchConstraintMaxWidth, mMatchConstraintMinHeight, mMatchConstraintMinWidth, mMatchConstraintPercentHeight, mMatchConstraintPercentWidth, mMinHeight, mMinWidth, mNextChainWidget, mOffsetX, mOffsetY, mParent, mResolvedMatchConstraintDefault, mRight, mTop, mVerticalResolution, mVerticalRun, mWeight, mX, mY, run, SOLVER, stringId, UNKNOWN, VERTICAL, verticalChainRun, verticalGroup, VISIBLE, WRAP_BEHAVIOR_HORIZONTAL_ONLY, WRAP_BEHAVIOR_INCLUDED, WRAP_BEHAVIOR_SKIPPED, WRAP_BEHAVIOR_VERTICAL_ONLY

Constructor Summary

Constructors

Constructor	Description
Placeholder()

Method Summary

Modifier and Type	Method	Description
void	addToSolver(LinearSystem system, boolean optimize)	Add this widget to the solver
void	measure(int widthMode, int widthSize, int heightMode, int heightSize)

Methods inherited from class androidx.constraintlayout.core.widgets.VirtualLayout

applyRtl, captureWidgets, contains, getMeasuredHeight, getMeasuredWidth, getPaddingBottom, getPaddingLeft, getPaddingRight, getPaddingTop, measure, measureChildren, needsCallbackFromSolver, needSolverPass, setMeasure, setPadding, setPaddingBottom, setPaddingEnd, setPaddingLeft, setPaddingRight, setPaddingStart, setPaddingTop, updateConstraints

Methods inherited from class androidx.constraintlayout.core.widgets.HelperWidget

add, addDependents, copy, findGroupInDependents, removeAllIds

Methods inherited from class androidx.constraintlayout.core.widgets.ConstraintWidget

addChildrenToSolverByDependency, allowedInBarrier, connect, connect, connect, connectCircularConstraint, createObjectVariables, ensureMeasureRequested, ensureWidgetRuns, getAnchor, getAnchors, getBaselineDistance, getBiasPercent, getBottom, getCompanionWidget, getContainerItemSkip, getDebugName, getDimensionBehaviour, getDimensionRatio, getDimensionRatioSide, getHasBaseline, getHeight, getHorizontalBiasPercent, getHorizontalChainControlWidget, getHorizontalChainStyle, getHorizontalDimensionBehaviour, getHorizontalMargin, getLastHorizontalMeasureSpec, getLastVerticalMeasureSpec, getLeft, getLength, getMaxHeight, getMaxWidth, getMinHeight, getMinWidth, getNextChainMember, getOptimizerWrapHeight, getOptimizerWrapWidth, getParent, getPreviousChainMember, getRight, getRootX, getRootY, getRun, getSceneString, getTop, getType, getVerticalBiasPercent, getVerticalChainControlWidget, getVerticalChainStyle, getVerticalDimensionBehaviour, getVerticalMargin, getVisibility, getWidth, getWrapBehaviorInParent, getX, getY, hasBaseline, hasDanglingDimension, hasDependencies, hasDimensionOverride, hasResolvedTargets, immediateConnect, isAnimated, isHeightWrapContent, isHorizontalSolvingPassDone, isInBarrier, isInHorizontalChain, isInPlaceholder, isInVerticalChain, isInVirtualLayout, isMeasureRequested, isResolvedHorizontally, isResolvedVertically, isRoot, isSpreadHeight, isSpreadWidth, isVerticalSolvingPassDone, isWidthWrapContent, markHorizontalSolvingPassDone, markVerticalSolvingPassDone, oppositeDimensionDependsOn, oppositeDimensionsTied, reset, resetAllConstraints, resetAnchor, resetAnchors, resetFinalResolution, resetSolverVariables, resetSolvingPassFlag, serialize, setAnimated, setBaselineDistance, setCompanionWidget, setContainerItemSkip, setDebugName, setDebugSolverName, setDimension, setDimensionRatio, setDimensionRatio, setFinalBaseline, setFinalFrame, setFinalHorizontal, setFinalLeft, setFinalTop, setFinalVertical, setFrame, setFrame, setGoneMargin, setHasBaseline, setHeight, setHeightWrapContent, setHorizontalBiasPercent, setHorizontalChainStyle, setHorizontalDimension, setHorizontalDimensionBehaviour, setHorizontalMatchStyle, setHorizontalWeight, setInBarrier, setInPlaceholder, setInVirtualLayout, setLastMeasureSpec, setLength, setMaxHeight, setMaxWidth, setMeasureRequested, setMinHeight, setMinWidth, setOffset, setOrigin, setParent, setType, setupDimensionRatio, setVerticalBiasPercent, setVerticalChainStyle, setVerticalDimension, setVerticalDimensionBehaviour, setVerticalMatchStyle, setVerticalWeight, setVisibility, setWidth, setWidthWrapContent, setWrapBehaviorInParent, setX, setY, toString, updateFromRuns, updateFromSolver

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Placeholder

public Placeholder()

Method Detail

measure

public void measure(int widthMode,
                    int widthSize,
                    int heightMode,
                    int heightSize)

Overrides:

measure in class VirtualLayout

addToSolver

public void addToSolver(LinearSystem system,
                        boolean optimize)

Description copied from class: ConstraintWidget

Add this widget to the solver

Overrides:

addToSolver in class ConstraintWidget

Parameters:

system - the solver we want to add the widget to

optimize - true if Optimizer.OPTIMIZATION_GRAPH is on